Flux 3 First-Last Frame to Video

bfl/flux-3/first-last-frame-to-video

Flux 3 First Last Frame To Video by BFL - animate still images into dynamic videos with AI. Transform photos into cinematic clips with natural motion, camera movement, and optional audio generation.

Use in agent Get API key

Base price: $0.85USD / run
Execution: async
Model type: video
Input fields: 7

Production route

Try the model

Playground

Open playground

Input

Prompt(string)

The text prompt describing the video you want to generate.

Start Image URL(string)

Upload

PNG, JPEG, WebP, or GIF · 20 MiB maximum

URL of the image used as the first frame of the video (PNG, JPEG, or WebP).

This field is required.

End Image URL(string)

Upload

PNG, JPEG, WebP, or GIF · 20 MiB maximum

URL of the image used as the last frame of the video (PNG, JPEG, or WebP).

This field is required.

Resolution(string)

Resolution of the generated video. Allowed values: 720p, 1080p.

Duration(integer)

Video duration in seconds (5-20). Allowed values: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.

Generate Audio(boolean)

Whether to generate audio for the video.

Aspect Ratio(string)

Output aspect ratio. Follows the input when omitted. Allowed values: 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16.

OutputReady

Your output will appear here

Complete the inputs, then click Run.

Model card

Specifications

Pricing

Base price: $0.85 / run

Context & modalities

Input: Schema-defined
Output: video

Capabilities

Chat: Not supported
Vision: Not supported
Reasoning: Not supported
Structured output: Not supported
Function calling: Not supported
Audio input: Not supported

Access

Provider: BFL
Model ID: bfl/flux-3/first-last-frame-to-video
Execution: async
API: Unified Run API
Endpoint: /v1/run

API README

Flux 3 First-Last Frame to Video

Flux 3 First Last Frame To Video belongs at the planned movement between two approved endpoints stage of a visual workflow. Rather than treating the model as an isolated demonstration, teams can place it inside briefing, review, selection, and handoff practices where creative control begins with agreement on both the opening and closing visual state, leaving the model to solve the intervening performance. This positioning clarifies why the model earns a place in a real creative pipeline and what kind of decision it helps people make.

A practical use of Flux 3 First Last Frame To Video is logo transitions, product transformations, pose changes, location reveals, and narrative beats whose destination must be known in advance. Begin by agreeing on the creative objective and review criteria, prepare only the source material needed for that objective, and compare results against audience, brand, editorial, and production needs. Technical request choices remain documented below so the prose can stay focused on planning and creative value.

Highlights

Boundary-frame fidelity. Keeps the supplied opening and ending compositions recognizable at their assigned moments.

Plausible intermediate action. Invents motion and scene development that logically connect the two visual anchors.

Camera-path coherence. Coordinates viewpoint changes and subject movement across the complete transition.

Joint audio generation. Creates speech, effects, and ambience that follow the events between the boundary images. FLUX 3 jointly models video and sound, grounding visual action, speech, effects, and ambience in one evolving scene.

Pricing

Option	Price
720p per second	$0.17
1080p per second	$0.29
5 seconds at 720p	$0.85

Billed per requested second of video.

When to Use

✅ Good fit	❌ Consider alternatives
The model's named workflow matches the source material and intended output	A different input modality or model route is required
A managed asynchronous result is suitable for the production pipeline	A synchronous, interactive editor is essential
The documented controls cover the required duration, framing, or format	The project needs controls outside this endpoint's schema
Creative iteration benefits from a repeatable request structure	Exact deterministic pixels, frames, geometry, or samples are mandatory
A finished downloadable media asset is the desired deliverable	Editable source layers or a native project file are required

Prompt Guide

For image-conditioned generation, state the intended result first, then add the subject or source treatment, progression, style, and delivery constraints. Keep one creative variable per phrase, use the documented field names for controls, and change one setting at a time when comparing results.

{
  "aspect_ratio": "21:9",
  "duration": 5,
  "image": "https://example.com/start-frame.png",
  "prompt": "A red panda walks along a mossy log in a sunlit forest, one continuous unbroken shot. Ambient birdsong and rustling leaves.",
  "resolution": "720p"
}

Technical Specs

Spec	Value
Model ID	`bfl/flux-3/first-last-frame-to-video`
Inputs	aspect_ratio, duration, end_image, generate_audio, image, prompt, resolution
Required inputs	prompt, image
Output fields	content_type, url
Execution	Async (submit, then poll for result)
Duration	5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20
Resolution	720p / 1080p
Aspect Ratio	21:9 / 16:9 / 3:2 / 4:3 / 5:4 / 1:1 / 4:5 / 3:4 / 2:3 / 9:16

Related Models

bfl/flux-3/first-last-frame-to-video/draft — Compare this concrete local family route.
bfl/flux-3/draft-enhance — Compare this concrete local family route.
bfl/flux-3/extend-video — Compare this concrete local family route.

Start building

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

Production API

Unified Run API endpoint

https://api.sandbase.ai/v1/run

Model ID

bfl/flux-3/first-last-frame-to-video

# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/run" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "bfl/flux-3/first-last-frame-to-video",
  "image": "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-1.jpeg",
  "prompt": "A red panda walks along a mossy log in a sunlit forest, one continuous unbroken shot. Ambient birdsong and rustling leaves.",
  "duration": 5,
  "end_image": "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-2.jpeg",
  "resolution": "720p",
  "generate_audio": true
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
  status=$(printf '%s' "$result" | jq -r .status)
  case "$status" in completed|failed|timeout) break ;; esac
  sleep 2
  result=$(curl --fail-with-body --silent \
    -H "Authorization: Bearer $SANDBASE_API_KEY" \
    "https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"

Choose your model

Compare models

All image & video models

Model	Type	Default price	Released
Flux 3 First-Last Frame to VideoThis model `BFL`	Video	$0.85 / run	Aug 4, 2026
Flux 3 Text to Video `BFL`	Video	$0.85 / run	Aug 4, 2026
Flux 3 Image to Video `BFL`	Video	$0.85 / run	Aug 4, 2026
Flux 3 Keyframes to Video `BFL`	Video	$0.85 / run	Aug 4, 2026
Flux 3 Video Extend `BFL`	Video	$2.05 / run	Aug 4, 2026
Flux 3 Text to Video Draft `BFL`	Video	$0.30 / run	Aug 4, 2026

Questions

FAQ

How do I call BFL Flux 3 First-Last Frame to Video through SandBase?

Create a SandBase API key, then send requests with the model ID "bfl/flux-3/first-last-frame-to-video" to Unified Run API (/v1/run) at https://api.sandbase.ai. The request examples on this page show the exact payload.

Do I need a separate BFL account?

No. One SandBase API key and balance gives you access to BFL Flux 3 First-Last Frame to Video and the other models in the catalog; you do not need to sign up with BFL separately.